大尺寸718塑料模具钢在线变频幅淬火工艺  

Online frequency-amplitude conversion quenching process of large 718 plastic die steel

作　　者：刘国勇[1] 王宽宽[1] 董栗明 宫世创 朱冬梅[1] 张少军[1] 

机构地区：[1]北京科技大学机械工程学院,北京100083 [2]东北特殊钢集团有限责任公司,辽宁大连116105

出　　处：《材料热处理学报》2016年第3期216-222,共7页Transactions of Materials and Heat Treatment

基　　金：中央高校基本科研业务费专项资金(FRF-TP-12-073A)

摘　　要：通过间接热力耦合对120 mm厚718塑料模具钢连续淬火、多道次淬火及变频幅淬火3种在线淬火工艺冷却过程温度场和应力/应变场进行了三维数值模拟。结果表明:与连续淬火工艺相比,多道次淬火工艺可获得较小的表心温差、等效塑性应变及等效应力最大值,但等效应力平均值有所增大,且淬火时间较长;与前两种工艺相比,变频幅淬火工艺可获得最小的表心温差、等效塑性应变、等效应力,以及比多道次淬火工艺较短的淬火时间,且由于关闭了部分喷嘴,起到了节水节能的作用,为优化大尺寸718塑料模具钢在线淬火工艺提供参考。For the 718 plastic die steel with 120 mm thickness,three-dimensional numerical simulations of temperature and stress-strain fields generated in three online quenching processes（ the continuous quenching process,the multi-pass quenching process and the online frequency-amplitude conversion quenching（ FACQ） process） are performed with indirect thermal-stress coupling computation. The results show a smaller temperature difference between the surface and centre,a smaller equivalent plastic strain,and a smaller maximum of the equivalent stress are obtained in the multi-pass quenching process,compared with the continuous quenching process,while the quenching time and the average value of the equivalent stress increase. Compared with the former two processes,the smallest temperature difference,equivalent plastic strain,and equivalent stress are achieved in the FACQ process,and a shorter quenching time is achieved than in the multi-pass quenching process. Furthermore,as some of the nozzles are closed,the FACQ process can save water and energy. The study can provide reference for optimizing the online quenching process of large 718 plastic die steel.

关 键 词：塑料模具钢 在线淬火 变频幅 数值模拟 

分 类 号：TG142.4[一般工业技术—材料科学与工程]